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大气科学  2011 

大兴安岭林区地闪放电特征的观测与分析

DOI: 10.3878/j.issn.1006-9895.2011.01.12

Keywords: 大兴安岭林区,雷暴,地闪,连续电流

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Abstract:

利用2009年夏季在大兴安岭林区开展的雷暴及闪电的多站GPS同步观测资料,详细分析了该地区的地闪放电特征。通过对464次地闪资料的分析,发现具有单次回击的地闪所占的比例高达69%,且正地闪比例较高,达到了22%。对连续电流的统计表明,约有27%的地闪伴随有连续电流过程且长连续电流过程主要出现在具有单次回击的负地闪中,其平均持续时间为127.4ms。进一步分析发现连续电流的持续时间与引发连续电流的回击电场变化及其回击之前击间间隔具有较好的对应关系:当引发连续电流回击电场变化及其之前击间间隔越小,连续电流持续时间越长。对两次正地闪的拟合研究表明,二者释放的电荷量相当可观,分别为38C、36C,海拔高度分别为7.6km、7.0km。

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